Electronic device and method for fabricating the same

ABSTRACT

Provided is an electronic device including a semiconductor memory. The semiconductor memory may include: an interlayer dielectric layer formed over a substrate including first and second areas; a first contact plug contacted with the substrate through the interlayer dielectric layer of the second area; an anti-peeling layer formed over the interlayer dielectric layer including the first contact plug; a second contact plug contacted with the substrate through the anti-peeling layer and the interlayer dielectric layer in the first area; and a variable resistance pattern contacted with the second contact plug.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent document claims priority of Korean Patent Application No.10-2014-0034071, entitled “ELECTRONIC DEVICE AND METHOD FOR FABRICATINGTHE SAME” and filed on Mar. 24, 2014, which is incorporated herein byreference in its entirety.

TECHNICAL FIELD

This patent document relates to memory circuits or devices and theirapplications in electronic devices or systems.

BACKGROUND

Recently, as electronic devices or appliances trend towardminiaturization, low power consumption, high performance,multi-functionality, and so on, there is a demand for semiconductordevices capable of storing information in various electronic devices orappliances such as a computer, a portable communication device, and soon, and research and development for such electronic devices have beenconducted. Examples of such semiconductor devices include semiconductordevices which can store data using a characteristic that they areswitched between different resistance states according to an appliedvoltage or current, for example, an RRAM (resistive random accessmemory), a PRAM (phase change random access memory), an FRAM(ferroelectric random access memory), an MRAM (magnetic random accessmemory), an E-fuse, etc.

SUMMARY

The disclosed technology in this patent document includes an electronicdevice including a semiconductor memory, which is capable of preventinga defect of a variable resistance element and improving thecharacteristic of the variable resistance element, and a method forfabricating the same.

In one aspect, an electronic device is provided to comprise asemiconductor memory which includes an interlayer dielectric layerformed over a substrate including first and second areas; a firstcontact plug contacted with the substrate to pass through the interlayerdielectric layer of the second area; an anti-peeling layer formed overthe interlayer dielectric layer including the first contact plug; asecond contact plug contacted with the substrate through theanti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with the secondcontact plug and above the anti-peeling layer. In one aspect, anelectronic device is provided to comprise a semiconductor memory whichincludes an interlayer dielectric layer formed over a substrateincluding first and second areas; a first contact plug formed over thesubstrate to pass through the interlayer dielectric layer of the secondarea; an anti-peeling layer formed over the interlayer dielectric layerincluding the first contact plug to cover the first contact plug; asecond contact plug formed over the substrate to pass through theanti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with and formed overthe second contact plug and above the anti-peeling layer.

In some implementations, a portion of the variable resistance pattern isformed over the anti-peeling layer. In some implementations, theanti-peeling layer includes a stacked structure of a passivation layerand an adhesive layer. In some implementations, the adhesive layer isformed around a top end of the second contact plug. In someimplementations, the passivation layer includes an insulating material.In some implementations, the adhesive layer includes silicon. In someimplementations, a top surface of the second contact plug is higher thana top surface of the first contact plug. In some implementations, theelectronic device may further include a conductive line formed over thevariable resistance pattern of the first area; and a third contact plugfor coupling the conductive line and the variable resistance pattern. Insome implementations, the electronic device may further include a thirdcontact plug formed over the variable resistance pattern of the firstarea; and a conductive line formed over the third contact plug andcoupled to the variable resistance pattern through the third contactplug. In some implementations, the electronic device may further includea metal wiring of the second area; and a fourth contact plug forcoupling the metal wiring and to the first contact plug.

In some implementations, the electronic device may further include amicroprocessor which includes: a control unit configured to receive asignal including a command from an outside of the microprocessor, andperforms extracting, decoding of the command, or controlling input oroutput of a signal of the microprocessor; an operation unit configuredto perform an operation based on a result that the control unit decodesthe command; and a memory unit configured to store data for performingthe operation, data corresponding to a result of performing theoperation, or an address of data for which the operation is performed,wherein the semiconductor memory unit is part of the memory unit in themicroprocessor.

In some implementations, the electronic device may further include aprocessor which includes: a core unit configured to perform, based on acommand inputted from an outside of the processor, an operationcorresponding to the command, by using data; a cache memory unitconfigured to store data for performing the operation, datacorresponding to a result of performing the operation, or an address ofdata for which the operation is performed; and a bus interface connectedbetween the core unit and the cache memory unit, and configured totransmit data between the core unit and the cache memory unit, whereinthe semiconductor memory unit is part of the cache memory unit in theprocessor.

In some implementations, the electronic device may further include aprocessing system which includes: a processor configured to decode acommand received by the processor and control an operation forinformation based on a result of decoding the command; an auxiliarymemory device configured to store a program for decoding the command andthe information; a main memory device configured to call and store theprogram and the information from the auxiliary memory device such thatthe processor can perform the operation using the program and theinformation when executing the program; and an interface deviceconfigured to perform communication between at least one of theprocessor, the auxiliary memory device and the main memory device andthe outside, wherein the semiconductor memory is part of the auxiliarymemory device or the main memory device in the processing system.

In some implementations, the electronic device may further include adata storage system which includes: a storage device configured to storedata and conserve stored data regardless of power supply; a controllerconfigured to control input and output of data to and from the storagedevice according to a command inputted form an outside; a temporarystorage device configured to temporarily store data exchanged betweenthe storage device and the outside; and an interface configured toperform communication between at least one of the storage device, thecontroller and the temporary storage device and the outside, wherein thesemiconductor memory is part of the storage device or the temporarystorage device in the data storage system.

In some implementations, the electronic device may further include amemory system which includes: a memory configured to store data andconserve stored data regardless of power supply; a memory controllerconfigured to control input and output of data to and from the memoryaccording to a command inputted form an outside; a buffer memoryconfigured to buffer data exchanged between the memory and the outside;and an interface configured to perform communication between at leastone of the memory, the memory controller and the buffer memory and theoutside, wherein the semiconductor memory unit is part of the memory orthe buffer memory in the memory system.

In another aspect, a method for fabricating an electronic device isprovided. The method may include forming a first interlayer dielectriclayer over a substrate including first and second areas; forming a firstcontact plug to be coupled to the substrate through the first interlayerdielectric layer of the second area; forming an anti-peeling layer overthe first interlayer dielectric layer including the first contact plug;forming a second contact plug to be coupled to the substrate through theanti-peeling layer and the first interlayer dielectric layer in thefirst area; and forming a variable resistance pattern to be contactedwith the second contact plug.

In another aspect, a method for fabricating an electronic device isprovided. The method may include a semiconductor memory, comprising:forming a first interlayer dielectric layer over a substrate includingfirst and second areas; forming a first contact plug over the substrateto pass through the first interlayer dielectric layer of the secondarea; forming an anti-peeling layer over the first interlayer dielectriclayer including the first contact plug to cover the first contact plug;after forming the anti-peeling layer covering the first contact plug,forming a second contact plug over the substrate to pass through theanti-peeling layer and the first interlayer dielectric layer in thefirst area; and subsequently forming a variable resistance pattern overthe second contact plug and above the anti-peeling layer.

In some implementations, the anti-peeling layer includes a stackedstructure of a passivation layer and an adhesive layer. In someimplementations, the anti-peeling layer includes nitride, oxide, orsilicon. In some implementations, the passivation layer includes aninsulating material. In some implementations, the adhesive layerincludes silicon. In some implementations, the forming of the secondcontact plug includes: forming a contact hole to pass through theanti-peeling layer and the first interlayer dielectric layer; burying aconductive material in the contact hole; and patterning the conductivematerial on the first interlayer dielectric layer. In someimplementations, the patterning of the conductive material is performedthrough an overall etching process or chemical mechanical polishingprocess. In some implementations, the patterning of the conductivematerial for forming the second contact plug is performed above theanti-peeling layer in the second area of the substrate so that the firstcontact plug underneath the anti-peeling layer is insulated thepatterning of the conductive material. In some implementations, theforming of the variable resistance pattern includes: forming a variableresistance layer over the anti-peeling layer including the secondcontact plug; and etching the variable resistance layer so as to formthe variable resistance pattern coupled to the second contact plug. Insome implementations, the forming of the variable resistance patternincludes: forming a variable resistance layer over the anti-peelinglayer including the second contact plug; and etching the variableresistance layer so as to form the variable resistance pattern over thesecond contact plug while isolating the first contact plug that iscovered by the anti-peeling layer from an impact of patterning thevariable resistance layer. In some implementations, the adhesive layeris etched in the forming of the variable resistance pattern. In someimplementations, the method may further include, after the forming ofthe variable resistance pattern: forming a second interlayer dielectriclayer over the anti-peeling layer so as to fill the space between thevariable resistance patterns; forming a third contact plug over thevariable resistance pattern to pass through the second interlayerdielectric layer of the first area; forming a fourth contact plug overthe first contact plug to pass through the second interlayer dielectriclayer and the anti-peeling layer in the second area; and forming aconductive line and a metal wiring to be contacted with the third andfourth contact plugs, respectively.

In another aspect, an electronic device is provided to comprise asemiconductor memory which includes a substrate including a first areaand a second area; a first contact plug and a second contact plug formedover the substrate of the second area and the first area, respectively;a variable resistance pattern formed over the second contact plug and inelectrical contact with the second contact plug; and an anti-peelinglayer formed to extend in both the first and second area to be above thefirst contact plug and below the variable resistance pattern andincludes an opening through which the second contact plug passes throughto reach the variable resistance pattern above the anti-peeling layer,wherein the anti-peeling layer isolates the first contact plug fromlayers formed above the anti-peeling layer and from fabricationprocesses performed after formation of the anti-peeling layer.

In some implementations, a top surface of the second contact plug ishigher than a top surface of the first contact plug. In someimplementations, the anti-peeling layer includes nitride, oxide, orsilicon. In some implementations, the anti-peeling layer includes astacked structure of a passivation layer and an adhesive layer.

Those and other aspects of the disclosed technology and theirimplementations and variations are described in greater detail in thedrawings, the description and the claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of a semiconductor device in accordancewith one implementation.

FIG. 2 is a cross-sectional view of a semiconductor device in accordancewith another implementation.

FIG. 3 is a cross-sectional view of a semiconductor device in accordancewith another implementation.

FIGS. 4A to 4F are cross-sectional views for explaining a method forfabricating the semiconductor device.

FIG. 5 is an example of configuration diagram of a microprocessorimplementing memory circuitry based on the disclosed technology.

FIG. 6 is an example of configuration diagram of a processorimplementing memory circuitry based on the disclosed technology.

FIG. 7 is an example of configuration diagram of a system implementingmemory circuitry based on the disclosed technology.

FIG. 8 is an example of configuration diagram of a data storage systemimplementing memory circuitry based on the disclosed technology.

FIG. 9 is an example of configuration diagram of a memory systemimplementing memory circuitry based on the disclosed technology.

DETAILED DESCRIPTION

Various examples and implementations of the disclosed technology aredescribed below in detail with reference to the accompanying drawings.

The drawings may not be necessarily to scale and in some instances,proportions of at least some of structures in the drawings may have beenexaggerated in order to clearly illustrate certain features of thedescribed examples or implementations. In presenting a specific examplein a drawing or description having two or more layers in a multi-layerstructure, the relative positioning relationship of such layers or thesequence of arranging the layers as shown reflects a particularimplementation for the described or illustrated example and a differentrelative positioning relationship or sequence of arranging the layersmay be possible. In addition, a described or illustrated example of amulti-layer structure may not reflect all layers present in thatparticular multilayer structure (e.g., one or more additional layers maybe present between two illustrated layers). As a specific example, whena first layer in a described or illustrated multi-layer structure isreferred to as being “on” or “over” a second layer or “on” or “over” asubstrate, the first layer may be directly formed on the second layer orthe substrate but may also represent a structure where one or more otherintermediate layers may exist between the first layer and the secondlayer or the substrate.

Disclosed implementations can be used to provide a semiconductor devicewhich includes an anti-peeling layer to prevent a defect caused bypeeling of a variable resistance layer in a peripheral area, and amethod for fabricating the same. Since a metal wiring contact forcoupling a substrate and a metal wiring in the peripheral area has alarge aspect ratio, it is difficult to form the metal wiring contact ata time. Thus, the metal wiring contact may be formed by repeating acontact process. For example, a process for a partial contact in theperipheral area, a process for a variable resistance pattern and a metalwiring in a cell area, and a process for a metal wiring in theperipheral area may be sequentially performed. However, during theprocess for forming the variable resistance pattern in the cell area, avariable resistance layer may be peeled to cause a defect in theperipheral area or attack the partial contact. In the disclosedimplementations, since the anti-peeling layer is additionally formedafter the partial contact is formed in the peripheral area, it ispossible to effectively reduce defects when forming the variableresistance pattern.

FIG. 1 is a cross-sectional view of a semiconductor device in accordancewith a first implementation.

As illustrated in FIG. 1, an isolation layer (not illustrated) may beformed in a semiconductor substrate 11 including first and second areas100 and 200. The first area 100 may include a cell area which caninclude at least one memory cell formed by a variable resistance patternfor storing data, and the second area 200 may include a peripheral areawhich can include driver circuits. Furthermore, a switching element maybe formed in the semiconductor substrate 11 of the first area 100 toselect a particular unit cell within a plurality of unit cells forperforming a reading or writing operation. The switching element mayinclude a gate electrode 12 and a sealing layer 13. Hereafter, the gateelectrode 12 serving as a switching element will be referred to as aswitching element 12. Between the switching elements 12, a landing plugcontact 14 may be formed.

An etch stop layer 15 and a first interlayer dielectric layer 16 may beformed over the semiconductor substrate 11 including the switchingelements 12 and the landing plug contact 14. Furthermore, a firstcontact plug 17 may be formed over the semiconductor substrate 11 of thesecond area 200. The first contact plug 17 may be coupled to thesemiconductor substrate 11 through the first interlayer dielectric layer16.

Notably, an anti-peeling layer 18 may be formed over the firstinterlayer dielectric layer 16 including the first contact plug 17 thatis embedded in the first interlayer dielectric layer 16. Thisanti-peeling-layer 18 is formed after the formation of the first contactplug 17 is completed but before a second contact plug 19 and a variableresistance pattern 23 on top of the second contact plug 19 are formed.The second contact plug 19 may be formed through the anti-peeling layer18 and the first interlayer dielectric layer 16 in the first area 100 soas to electrically couple the landing plug contact 14 and the variableresistance pattern 23.

The variable resistance pattern 23 may be formed over the second contactplug 19 of the first area 100. The variable resistance pattern 23 may,in this particular examples shown in FIG. 1, have the same criticaldimension (CD) as the second contact plug 19. Furthermore, a secondinterlayer dielectric layer 24 may be formed to fill the space betweenthe variable resistance patterns 23. A conductive line 27 may be formedover the second interlayer dielectric layer 24 in the first area 100,and a metal wiring 28 may be formed over the second interlayerdielectric layer 24 in the second area 200. The first area 100 mayinclude a third contact plug 25 which is formed through the secondinterlayer dielectric layer 24 so as to electrically couple theconductive line 27 and the variable resistance pattern 23, and thesecond area 200 may include a fourth contact plug 26 which is formedthrough the second interlayer dielectric layer 24 and the anti-peelinglayer 18 so as to electrically couple the first contact plug 17 and themetal wiring 28.

In the present implementation in FIG. 1, the anti-peeling layer 18 maybe formed between the first and second interlayer dielectric layers 16and 24. The anti-peeling layer 18 may serve to prevent an attack, i.e.,any significant adverse effect, on the first contact plug 17 when thesecond contact plug 19 is subsequently formed. In addition, theanti-peeling layer 18 may serve to prevent peeling when a variableresistance layer is deposited and patterned during a subsequent processfor forming the variable resistance pattern 23. Thus, it is possible toprevent a particle source from being generated in the peripheral area,for example, the second area 200, due to peeling of the variableresistance layer. The anti-peeling layer 18 may include, for example,nitride, oxide, or silicon.

The anti-peeling layer 18 may be formed between the process for formingthe first contact plug 17 and the subsequent process for forming thesecond contact plug 19. Thus, the first and second contact plugs 17 and19 may have a level difference corresponding to the height of theanti-peeling layer 18.

The switching element 12 may serve to select a specific unit cell in asemiconductor device including a plurality of unit cells where each suchunit cell is located in the first area 100. The switching element 12 maybe disposed in each of the unit cells, and include a transistor, a diodeand the like. In the present implementation in FIG. 1, the switchingelement may be formed in a buried gate type. In other implementations,the switching element is not limited to the buried gate type and may beformed in all types of suitable gate configurations. One end of theswitching element may be electrically coupled to the second contact plug19, and the other end of the switching element may be electricallycoupled to a source line (not illustrated).

The etch stop layer 15 may serve to prevent damage to the semiconductorsubstrate 11, when the first and second contact plugs 17 and 19 areformed. The etch stop layer 15 may include a material having an etchselectivity with respect to the semiconductor substrate 11 and the firstinterlayer dielectric layer 16. The etch stop layer 15 may include, forexample, nitride.

The first and second interlayer dielectric layers 16 and 24 may includean insulating material. For example, the first and second interlayerdielectric layers 16 and 24 may include an oxide.

The variable resistance pattern 23 may include a magnetic tunneljunction (MTJ) and layers disposed under and/or over the MTJ. The MTJmay include two magnetic layers 20 and 22 and a tunnel barrier layer 21interposed therebetween, and the layers disposed under and/or over theMTJ may serve to improve the characteristic of the variable resistanceelement or facilitate the fabrication process.

The variable resistance pattern 23 may have a characteristic ofswitching between different resistance states according to the relativemagnetization directions of the two magnetic layers 20 and 22. Forexample, when the magnetization directions of the two magnetic layers 20and 22 are parallel to each other, the variable resistance pattern 23may have a low resistance state, and when the magnetization directionsof the two magnetic layers 20 and 22 are anti-parallel to each other,the variable resistance pattern 23 may have a high resistance state.

One of the first and second magnetic layers 20 and 22 may include apinned ferromagnetic layer of which the magnetization direction ispinned, and the other may include a free ferromagnetic layer of whichthe magnetization direction is varied according to the direction of acurrent applied to the variable resistance pattern 23. The first andsecond magnetic layers 20 and 22 may include a ferromagnetic material.For example, the ferromagnetic material may have a single-layer ormultilayer structure including Fe—Pt alloy, Fe—Pd alloy, Co—Pd alloy,Co—Pt alloy, Fe—Ni—Pt alloy, Co—Fe—Pt alloy, Co—Ni—Pt alloy, Fe—Pdalloy, Co—Pd alloy, Co—Pt alloy, Fe—Ni—Pt alloy, Co—Fe—Pt alloy,Co—Ni—Pt alloy or the like, and may further include an impurity such asboron (B). However, the materials for the first and second magneticlayers 20 and 22 are not limited to the above mentioned materials andother ferromagnetic materials may also be used.

The tunnel barrier layer 21 may change the magnetization direction ofthe free ferromagnetic layer through tunneling of electrons. The tunnelbarrier layer 21 may have a single-layer or multilayer structureincluding a dielectric material, for example, oxide such as Al₂O₃, MgO,CaO, SrO, TiO, VO, or NbO. The tunnel barrier layer 21 may also beimplemented by other dialectic materials.

The first to fourth contact plugs 17, 19, 25, and 26, the conductiveline 27, and the metal wiring 28 may include a semiconductor layer ormetallic layer. The second contact plug 19 may serve as a bottomelectrode contact (BEC) of the variable resistance pattern 23. The thirdcontact plug 25 may serve as a top electrode contact (TEC) of thevariable resistance pattern 23. FIG. 1 illustrates that the conductiveline 27 and the metal wiring 28 are formed on the same line. However,depending on the process, the conductive line 27 and the metal wiring 28may be formed with a level difference therebetween.

FIG. 2 is a cross-sectional view of a semiconductor device in accordancewith a second implementation.

As illustrated in FIG. 2, an isolation layer (not illustrated) may beformed in a semiconductor substrate 31 including first and second areas300 and 400. The first area 300 may include a cell area, and the secondarea 400 may include a peripheral area. Furthermore, a switching elementmay be formed in the semiconductor substrate 31 of the first area 300.The switching element may include a gate electrode 32 and a sealinglayer 33. Hereafter, the gate electrode 32 serving as a switchingelement may be referred to as a switching element 32. Between theswitching elements 32, a landing plug contact 34 may be formed.

An etch stop layer 35 and a first interlayer dielectric layer 36 may beformed over the semiconductor substrate 31 including the switchingelements 32 and the landing plug contact 34. Furthermore, a firstcontact plug 37 may be formed over the semiconductor substrate 31 of thesecond area 400. The first contact plug 37 may be coupled to thesemiconductor substrate 31 through the first interlayer dielectric layer36.

An anti-peeling layer 38 may be formed over the first interlayerdielectric layer 36 including the first contact plug 37. Furthermore, asecond contact plug 39 may be formed through the anti-peeling layer 38and the first interlayer dielectric layer 36 in the first area 300 so asto electrically couple the landing plug contact 34 and a variableresistance pattern 43.

The variable resistance pattern 43 may be formed over the second contactplug 39 and the anti-peeling layer 38 in the first area 300.Furthermore, a second interlayer dielectric layer 44 may be formed tofill the space between the variable resistance patterns 43. A conductiveline 47 may be formed over the second interlayer dielectric layer 44 ofthe first area 300, and a metal wiring 48 may be formed over the secondinterlayer dielectric layer 44 of the second area 400. The first area300 may include a third contact plug 45 which is formed through thesecond interlayer dielectric layer 44 so as to electrically couple theconductive line 47 and the variable resistance pattern 43, and thesecond area 400 may include a fourth contact plug 46 which is formedthrough the second interlayer dielectric layer 44 and the anti-peelinglayer 38 so as to electrically couple the first contact plug 37 and themetal wiring 48.

In the present implementation in FIG. 2, the anti-peeling layer 38 maybe formed between the first and second interlayer dielectric layers 36and 44. The anti-peeling layer 38 may serve to prevent an attack, i.e.,any significant adverse effect, on the first contact plug 37 when thesecond contact plug 39 is subsequently formed. In addition, theanti-peeling layer 38 may serve to prevent peeling when a variableresistance layer is deposited and patterned during a subsequent processfor forming the variable resistance pattern 43. Thus, it is possible toprevent a particle source from being generated in the peripheral area,for example, the second area 400, due to peeling of the variableresistance layer. In the specific configuration in FIG. 2, the variableresistance pattern 43 is shown to have a larger CD than the secondcontact plug 39 and is formed in the first area 300. The adhesion of thevariable resistance pattern 43 to the lower layer may be improved due tothe larger CD of the variable resistance pattern 43. The anti-peelinglayer 38 may include, for example, nitride, oxide, or silicon.

The anti-peeling layer 38 may be formed between the process for formingthe first contact plug 37 and the process for forming the second contactplug 39. Thus, the first and second contact plugs 37 and 39 may have alevel difference corresponding to the height of the anti-peeling layer38.

FIG. 3 is a cross-sectional view of a semiconductor device in accordancewith a third implementation.

As illustrated in FIG. 3, an isolation layer (not illustrated) may beformed in a semiconductor substrate 51 including first and second areas500 and 600. The first area 500 may include a cell area, and the secondarea 600 may include a peripheral area. Furthermore, a switching elementmay be formed in the semiconductor substrate 51 of the first area 500.The switching element may include a gate electrode 52 and a sealinglayer 53. Hereafter, the gate electrode 52 serving as a switchingelement may be referred to as a switching element 52. Between theswitching elements 52, a landing plug contact 54 may be formed.

An etch stop layer 55 and a first interlayer dielectric layer 56 may beformed over the semiconductor substrate 51 including the switchingelements 52 and the landing plug contact 54. Furthermore, a firstcontact plug 57 may be formed over the semiconductor substrate 51 of thesecond area 600. The first contact plug 57 may be coupled to thesemiconductor substrate 51 through the first interlayer dielectric layer56.

An anti-peeling layer 58 may be formed over the first interlayerdielectric layer 56 including the first contact plug 57. Furthermore, asecond contact plug 59 may be formed through the anti-peeling layer 58and the first interlayer dielectric layer 56 in the first area 500 so asto electrically couple the landing plug contact 54 and a variableresistance pattern 63.

The variable resistance pattern 63 may be formed over the anti-peelinglayer 58 of the first area 500. Furthermore, a second interlayerdielectric layer 64 may be formed to fill the space between the variableresistance patterns 63. A conductive line 67 may be formed over thesecond interlayer dielectric layer 64 of the first area 500, and a metalwiring 68 may be formed over the second interlayer dielectric layer 64of the second area 600. The first area 500 may include a third contactplug 65 which formed through the second interlayer dielectric layer 64so as to electrically couple the conductive line 67 and the variableresistance pattern 63, and the second area 600 may include a fourthcontact plug 66 which is formed through the second interlayer dielectriclayer 64 and the anti-peeling layer 58 so as to electrically couple thefirst contact plug 57 and the metal wiring 68.

In the present implementation, the anti-peeling layer 58 may be formedbetween the first and second interlayer dielectric layers 56 and 64. Theanti-peeling layer 58 may serve to prevent an attack on the firstcontact plug 57 when the second contact plug 59 is subsequently formed.In addition, the anti-peeling layer 58 may serve to prevent peeling whena variable resistance layer is deposited and patterned during asubsequent process forming the variable resistance pattern 63. Thus, itis possible to prevent a particle source from being generated in theperipheral area, for example, the second area 600, due to peeling of thevariable resistance layer. The anti-peeling layer 58 may have asingle-layer or multilayer structure. The anti-peeling layer 58 having amultilayer structure may include a stacked structure of a passivationlayer 58A and an adhesive layer 58B. The passivation layer 58A mayinclude nitride, oxide, or a stacked structure thereof. The adhesivelayer 58B may include, for example, silicon. The adhesive layer 58B maybe etched when the variable resistance pattern 63 is formed, and theadhesive layer 58B after the etching process is an adhesive area leftunder the variable resistance pattern 63 to have the same CD as thevariable resistance pattern 63. The adhesive layer 58B under thevariable resistance pattern 63 may improve adhesion of the variableresistance pattern 63 to the lower layer.

The anti-peeling layer 58 may be formed between the process for formingthe first contact plug 57 and the process for forming the second contactplug 59. Thus, the first and second contact plugs 57 and 59 may have alevel difference corresponding to the height of the anti-peeling layer58.

FIGS. 4A to 4F are cross-sectional views for explaining a method forfabricating the semiconductor device. For example, FIGS. 4A to 4F arecross-sectional views illustrating a method for fabricating thesemiconductor device of FIG. 3. In FIGS. 4A to 4F, the same referencenumerals are used as those of FIG. 3 to identify same or similarelements.

As illustrated in FIG. 4A, a switching element 52 may be formed in afirst area 500 of a semiconductor substrate 51 which includes the firstarea 500 and a second area 600. The first area 500 may include a cellarea, and the second area 600 may include a peripheral area.

The switching element 52 may be formed in a buried gate type. Theswitching element 52 may include a stacked structure of a buried gateelectrode 52 and a sealing layer 53.

Between the switching elements 52, a landing plug contact 54 may beformed. The landing plug contact 54 may include a metallic layer. Themetallic layer may include a conductive layer containing a metalelement, and include a metal, metal oxide, metal nitride, metaloxynitride, metal silicide or the like. For example, the landing plugcontact 54 may include titanium nitride (TiN).

An etch stop layer 55 may be formed over the semiconductor substrate 51including the switching element 52. The etch stop layer 55 may serve toprevent damage to the semiconductor substrate 51 when a first contactplug 57 and a second contact plug are formed. The etch stop layer 55 mayinclude a material having an etch selectivity with respect to a firstinterlayer dielectric layer 56 and the semiconductor substrate 51. Theetch stop layer 55 may include, for example, nitride.

The first interlayer dielectric layer 56 may be formed over the etchstop layer 55. The first interlayer dielectric layer 56 may include amaterial having an etch selectivity with respect to the etch stop layer55. For example, the first interlayer dielectric layer 56 may includeoxide or oxynitride. The first interlayer dielectric layer 56 may have asingle-layer or multilayer structure.

Next, the first contact plug 57 may be formed in the second area 600before forming the second contact plug 59 for providing electricalcontact to the variable resistance pattern 63. The first contact plug 57is coupled to the semiconductor substrate 51 through the firstinterlayer dielectric layer 56 and the etch stop layer 55 of the secondarea 600. The first contact plug 57 may be formed through a series ofprocesses. For example, such processes may include a process of forminga contact hole to expose the semiconductor substrate 51 through thefirst interlayer dielectric layer 56 and the etch stop layer 55, aprocess of forming a conductive material on the entire surface of theresultant structure so as to gap-fill the contact hole, or a process ofelectrically isolating the first contact plugs 57 adjacent to eachother. The isolation process may be performed using an overall etchingprocess (for example, etch-back) or chemical mechanical polishingprocess. More specifically, the isolation process may be performed byetching or polishing the conductive material formed on the entiresurface of the resultant structure until the first interlayer dielectriclayer 56 is exposed.

As illustrated in FIG. 4B, an anti-peeling layer 58 may be formed overthe first interlayer dielectric layer 56 including the first contactplug 57 that is embedded in the first interlayer dielectric layer 56.The anti-peeling layer 58 may serve to prevent damage to the firstcontact plug 57 when the second contact plug 59 is subsequently formed.In addition, the anti-peeling layer 58 may serve to prevent peeling of avariable resistance layer that is formed at a later stage.

The anti-peeling layer 58 may include a stacked structure of apassivation layer 58A and an adhesive layer 58B. The passivation layer58A may include an insulating material, and the adhesive layer 58B mayinclude silicon. For example, the passivation layer 58A may includeoxide, nitride, or a stacked structure thereof. FIG. 4B illustrates thatthe anti-peeling layer 58 includes the stacked structure of thepassivation layer 58A and the adhesive layer 58B. However, otherimplementations are also possible on the structure of the anti-peelinglayer 58. For example, as illustrated in FIG. 1 or 2, the anti-peelinglayer 58 may have a single-layer structure.

The thickness of the anti-peeling layer 58 may be adjusted inconsideration of various factors. For example, a loss caused during asubsequent process including a polishing process for forming the secondcontact plug or an etching process for forming a variable resistancepattern can be considered. For example, the anti-peeling layer 58 mayhave a thickness of 100 Å or less.

As illustrated in FIG. 4C, the second contact plug 59 may be formed inthe first area 500 to pass through the anti-peeling layer 58, the firstinterlayer dielectric layer 56, and the etch stop layer 55.

The second contact plug 59 may be formed through a series of processes.First, a contact hole is formed to expose the landing plug contact 54passing through the anti-peeling layer 58, the first interlayerdielectric layer 56, and the etch stop layer 55. Next, a conductivematerial is formed on the entire surface of the resultant structure soas to gap-fill the contact hole. Then, the second contact plugs 59adjacent to each other are electrically isolated. The isolation processmay be performed through an overall etching process (for example,etch-back) or chemical mechanical polishing process. More specifically,the isolation process may be performed by etching or polishing theconductive material formed on the entire surface of the resultantstructure until the anti-peeling layer 58 is exposed.

Due to presence of the anti-peeling layer 58, at this stage of formingthe second contact plug 59, the first contact plug 57 of the second area600 is covered by the anti-peeling layer 58 and is not directly exposedto the processes in forming the second contact plug 59 including, e.g.,the polishing process during formation of the second contact plug 59.Therefore, the first contact plug 57 is insulated from the adverseeffects or damage that may cause by the formation of the second contactplug 59 and thus is protected.

As illustrated in FIG. 4D, layers for forming a variable resistanceelement such as layers 60A, 61A and 62A may be formed over theanti-peeling layer 58 including the second contact plug 59 embedded inthe dielectric layer 56 and penetrating through the anti-peeling layer58 while the first contact plug 57 is underneath and covered by thefirst contact plug 57. The variable resistance element layers 60A, 61Aand 62A may have a stacked structure of ferromagnetic materials forforming magnetic layers 60A and 62A and an insulating material forforming a tunnel barrier layer 61A between the layers 60A and 62A.Furthermore, conductive materials (not illustrated) for formingelectrodes may be formed over and under the ferromagnetic materials 60Aand 62A.

Under this configuration, the anti-peeling layer 58 may improve adhesionto the variable resistance layer so as to prevent peeling in the secondarea 600. Thus, it is possible to prevent a defect caused by lifting orthe like. Furthermore, when the adhesive layer 58B is formed ofamorphous silicon, the adhesive layer 58B has no or little significantinfluence on crystallization when the variable resistance layer isformed. Thus, the adhesion may be improved without changing thecharacteristic or resistance of the variable resistance layer.

As illustrated in FIG. 4E, the variable resistance layer may be etchedto form a variable resistance pattern 63 in the first area 500 while theportion of the variable resistance layer above the anti-peeling layer 58in the area 600 is removed. The variable resistance pattern 63 may havea stacked structure of a first magnetic layer 60, a tunnel barrier layer61, and a second magnetic layer 62. Furthermore, a spacer (notillustrated) may be formed on the sidewalls of the variable resistancepattern 63. Furthermore, a first electrode (not illustrated) may beformed under the first magnetic layer 60, and a second electrode (notillustrated) may be formed over the second magnetic layer 62. Inaddition, a template layer, a coupling layer, and an interface layer maybe formed to improve the characteristics of the respective magneticlayers.

During the etching process for forming the variable resistance pattern63, the adhesive layer 58B of the anti-peeling layer 58 may be etchedtogether. Thus, the adhesive layer 58B may be remained under thevariable resistance pattern 63, while having the same CD as the variableresistance pattern 63. While the adhesive layer 58B is etched, theadhesive layer 58B may be re-deposited on the sidewalls of the variableresistance pattern 63. However, when the adhesive layer 58B is formed ofsilicon, an oxidation process may be selectively performed. Since thesidewalls are insulated through the selective oxidation process, theadhesive layer 58B may have no influence on the device characteristic.

In the present implementation as illustrated in FIGS. 4A-4F, since thefirst contact plug 57 is not exposed through the anti-peeling layer 58when both the second contact plug 59 is formed after the formation ofthe first contact plug 57 and the variable resistance pattern 63 isformed after formation of the second contact plug 59, the first contactplug 57 is protected by the anti-peeling layer 58 against adverseeffects in forming the second contact plug 59 and the variableresistance pattern 63 without being subject to any significant damage.Furthermore, the passivation layer 58A may be remained due to etchselectivity, thereby preventing the exposure and damage of the firstinterlayer dielectric layer 56.

As illustrated in FIG. 4F, a second interlayer dielectric layer 64 maybe formed over the anti-peeling layer 58. The second interlayerdielectric layer 64 may be formed to a thickness enough to fill thespace between the variable resistance patterns 63. For example, the topsurface of the second interlayer dielectric layer 64 may be higher thanthe top surface of the variable resistance pattern 63. The secondinterlayer dielectric layer 64 may be formed of the same material as thefirst interlayer dielectric layer 56. The second interlayer dielectriclayer 64 may include oxide, nitride, oxynitride, or a stacked structurethereof.

Then, a third contact plug 65 may be formed to be coupled to thevariable resistance pattern 63 through the second interlayer dielectriclayer 64 of the first area 500. The third contact plug 65 may be formedthrough a series of processes. For example, such processes may include aprocess of forming a contact hole through a part of the secondinterlayer dielectric layer 64 so as to expose the top of the variableresistance pattern, a process of forming a conductive material on theentire surface of the resultant structure so as to gap-fill the contacthole, or a process of electrically isolating the third contact plugs 65adjacent to each other. The third contact plug 65 may serve toelectrically couple the conductive line 67 and the variable resistancepattern 63. Further, the third contact plug 65 may serve as an electrodefor the variable resistance pattern 63, for example, a top electrodecontact (TEC).

Then, a fourth contact plug 66 may be formed to be coupled to the firstcontact plug 57 through the second interlayer dielectric layer 64 andthe anti-peeling layer 58 in the second area 600. The fourth contactplug 66 may be formed through a series of processes of forming a contacthole through the second interlayer dielectric layer 64 and theanti-peeling layer 58 so as to expose the first contact plug 57, forminga conductive material on the entire surface of the resultant structureso as to gap-fill the contact hole, and performing an isolation processof electrically isolating the fourth contact plugs 66 adjacent to eachother.

Then, a conductive line 67 coupled to the third contact plug 65 of thefirst area 500 and a metal wiring 68 coupled to the fourth contact plug66 of the second area 600 may be formed. The conductive line 67 and themetal wiring 68 may include a stacked structure of a barrier layer and ametallic layer.

In one implementation in FIG. 3, the conductive line 67 and the metalwiring 68 may be formed on the same line. However, other implementationsare also possible. The conductive line 67 and the metal wiring 68 mayhave a level difference therebetween, and the fourth contact plug 66 andthe metal wiring 68 may be formed after the conductive line 67 isformed.

In accordance with the above-described implementations, it is possibleto prevent a defect of the variable resistance element and improve thecharacteristic of the variable resistance element.

The above and other memory circuits or semiconductor devices based onthe disclosed technology can be used in a range of devices or systems.FIGS. 5-9 provide some examples of devices or systems that can implementthe memory circuits disclosed herein.

FIG. 5 is an example of configuration diagram of a microprocessorimplementing memory circuitry based on the disclosed technology.

Referring to FIG. 5, a microprocessor 1000 may perform tasks forcontrolling and tuning a series of processes of receiving data fromvarious external devices, processing the data, and outputting processingresults to external devices. The microprocessor 1000 may include amemory unit 1010, an operation unit 1020, a control unit 1030, and soon. The microprocessor 1000 may be various data processing units such asa central processing unit (CPU), a graphic processing unit (GPU), adigital signal processor (DSP) and an application processor (AP).

The memory unit 1010 is a part which stores data in the microprocessor1000, as a processor register, register or the like. The memory unit1010 may include a data register, an address register, a floating pointregister and so on. Besides, the memory unit 1010 may include variousregisters. The memory unit 1010 may perform the function of temporarilystoring data for which operations are to be performed by the operationunit 1020, result data of performing the operations and addresses wheredata for performing of the operations are stored.

The memory unit 1010 may include one or more of the above-describedsemiconductor devices in accordance with the implementations. Forexample, the memory unit 1010 may include an interlayer dielectric layerformed over a substrate including first and second areas; a firstcontact plug contacted with the substrate through the interlayerdielectric layer of the second area; an anti-peeling layer formed overthe interlayer dielectric layer including the first contact plug; asecond contact plug contacted with the substrate through theanti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with the secondcontact plug. Through this, a fabrication process of the memory unit1010 may be performed to improve the characteristic of the memory unit1010. As a consequence, operating characteristics of the microprocessor1000 may be improved.

The operation unit 1020 may perform four arithmetical operations orlogical operations according to results that the control unit 1030decodes commands. The operation unit 1020 may include at least onearithmetic logic unit (ALU) and so on.

The control unit 1030 may receive signals from the memory unit 1010, theoperation unit 1020 and an external device of the microprocessor 1000,perform extraction, decoding of commands, and controlling input andoutput of signals of the microprocessor 1000, and execute processingrepresented by programs.

The microprocessor 1000 according to the present implementation mayadditionally include a cache memory unit 1040 which can temporarilystore data to be inputted from an external device other than the memoryunit 1010 or to be outputted to an external device. In this case, thecache memory unit 1040 may exchange data with the memory unit 1010, theoperation unit 1020 and the control unit 1030 through a bus interface1050.

FIG. 6 is an example of configuration diagram of a processorimplementing memory circuitry based on the disclosed technology.

Referring to FIG. 6, a processor 1100 may improve performance andrealize multi-functionality by including various functions other thanthose of a microprocessor which performs tasks for controlling andtuning a series of processes of receiving data from various externaldevices, processing the data, and outputting processing results toexternal devices. The processor 1100 may include a core unit 1110 whichserves as the microprocessor, a cache memory unit 1120 which serves tostoring data temporarily, and a bus interface 1130 for transferring databetween internal and external devices. The processor 1100 may includevarious system-on-chips (SoCs) such as a multi-core processor, a graphicprocessing unit (GPU) and an application processor (AP).

The core unit 1110 of the present implementation is a part whichperforms arithmetic logic operations for data inputted from an externaldevice, and may include a memory unit 1111, an operation unit 1112 and acontrol unit 1113.

The memory unit 1111 is a part which stores data in the processor 1100,as a processor register, a register or the like. The memory unit 1111may include a data register, an address register, a floating pointregister and so on. Besides, the memory unit 1111 may include variousregisters. The memory unit 1111 may perform the function of temporarilystoring data for which operations are to be performed by the operationunit 1112, result data of performing the operations and addresses wheredata for performing of the operations are stored. The operation unit1112 is a part which performs operations in the processor 1100. Theoperation unit 1112 may perform four arithmetical operations, logicaloperations, according to results that the control unit 1113 decodescommands, or the like. The operation unit 1112 may include at least onearithmetic logic unit (ALU) and so on. The control unit 1113 may receivesignals from the memory unit 1111, the operation unit 1112 and anexternal device of the processor 1100, perform extraction, decoding ofcommands, controlling input and output of signals of processor 1100, andexecute processing represented by programs.

The cache memory unit 1120 is a part which temporarily stores data tocompensate for a difference in data processing speed between the coreunit 1110 operating at a high speed and an external device operating ata low speed. The cache memory unit 1120 may include a primary storagesection 1121, a secondary storage section 1122 and a tertiary storagesection 1123. In general, the cache memory unit 1120 includes theprimary and secondary storage sections 1121 and 1122, and may includethe tertiary storage section 1123 in the case where high storagecapacity is required. As the occasion demands, the cache memory unit1120 may include an increased number of storage sections. That is tosay, the number of storage sections which are included in the cachememory unit 1120 may be changed according to a design. The speeds atwhich the primary, secondary and tertiary storage sections 1121, 1122and 1123 store and discriminate data may be the same or different. Inthe case where the speeds of the respective storage sections 1121, 1122and 1123 are different, the speed of the primary storage section 1121may be largest. At least one storage section of the primary storagesection 1121, the secondary storage section 1122 and the tertiarystorage section 1123 of the cache memory unit 1120 may include one ormore of the above-described semiconductor devices in accordance with theimplementations. For example, the cache memory unit 1120 may include aninterlayer dielectric layer formed over a substrate including first andsecond areas; a first contact plug contacted with the substrate throughthe interlayer dielectric layer of the second area; an anti-peelinglayer formed over the interlayer dielectric layer including the firstcontact plug; a second contact plug contacted with the substrate throughthe anti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with the secondcontact plug. Through this, a fabrication process of the cache memoryunit 1120 may be performed to improve the characteristic of the cachememory unit 1120. As a consequence, operating characteristics of theprocessor 1100 may be improved.

Although it was shown in FIG. 6 that all the primary, secondary andtertiary storage sections 1121, 1122 and 1123 are configured inside thecache memory unit 1120, it is to be noted that all the primary,secondary and tertiary storage sections 1121, 1122 and 1123 of the cachememory unit 1120 may be configured outside the core unit 1110 and maycompensate for a difference in data processing speed between the coreunit 1110 and the external device. Meanwhile, it is to be noted that theprimary storage section 1121 of the cache memory unit 1120 may bedisposed inside the core unit 1110 and the secondary storage section1122 and the tertiary storage section 1123 may be configured outside thecore unit 1110 to strengthen the function of compensating for adifference in data processing speed. In another implementation, theprimary and secondary storage sections 1121, 1122 may be disposed insidethe core units 1110 and tertiary storage sections 1123 may be disposedoutside core units 1110.

The bus interface 1130 is a part which connects the core unit 1110, thecache memory unit 1120 and external device and allows data to beefficiently transmitted.

The processor 1100 according to the present implementation may include aplurality of core units 1110, and the plurality of core units 1110 mayshare the cache memory unit 1120. The plurality of core units 1110 andthe cache memory unit 1120 may be directly connected or be connectedthrough the bus interface 1130. The plurality of core units 1110 may beconfigured in the same way as the above-described configuration of thecore unit 1110. In the case where the processor 1100 includes theplurality of core unit 1110, the primary storage section 1121 of thecache memory unit 1120 may be configured in each core unit 1110 incorrespondence to the number of the plurality of core units 1110, andthe secondary storage section 1122 and the tertiary storage section 1123may be configured outside the plurality of core units 1110 in such a wayas to be shared through the bus interface 1130. The processing speed ofthe primary storage section 1121 may be larger than the processingspeeds of the secondary and tertiary storage section 1122 and 1123. Inanother implementation, the primary storage section 1121 and thesecondary storage section 1122 may be configured in each core unit 1110in correspondence to the number of the plurality of core units 1110, andthe tertiary storage section 1123 may be configured outside theplurality of core units 1110 in such a way as to be shared through thebus interface 1130.

The processor 1100 according to the present implementation may furtherinclude an embedded memory unit 1140 which stores data, a communicationmodule unit 1150 which can transmit and receive data to and from anexternal device in a wired or wireless manner, a memory control unit1160 which drives an external memory device, and a media processing unit1170 which processes the data processed in the processor 1100 or thedata inputted from an external input device and outputs the processeddata to an external interface device and so on. Besides, the processor1100 may include a plurality of various modules and devices. In thiscase, the plurality of modules which are added may exchange data withthe core units 1110 and the cache memory unit 1120 and with one another,through the bus interface 1130.

The embedded memory unit 1140 may include not only a volatile memory butalso a nonvolatile memory. The volatile memory may include a DRAM(dynamic random access memory), a mobile DRAM, an SRAM (static randomaccess memory), and a memory with similar functions to above mentionedmemories, and so on. The nonvolatile memory may include a ROM (read onlymemory), a NOR flash memory, a NAND flash memory, a phase change randomaccess memory (PRAM), a resistive random access memory (RRAM), a spintransfer torque random access memory (STTRAM), a magnetic random accessmemory (MRAM), a memory with similar functions.

The communication module unit 1150 may include a module capable of beingconnected with a wired network, a module capable of being connected witha wireless network and both of them. The wired network module mayinclude a local area network (LAN), a universal serial bus (USB), anEthernet, power line communication (PLC) such as various devices whichsend and receive data through transmit lines, and so on. The wirelessnetwork module may include Infrared Data Association (IrDA), codedivision multiple access (CDMA), time division multiple access (TDMA),frequency division multiple access (FDMA), a wireless LAN, Zigbee, aubiquitous sensor network (USN), Bluetooth, radio frequencyidentification (RFID), long term evolution (LTE), near fieldcommunication (NFC), a wireless broadband Internet (Wibro), high speeddownlink packet access (HSDPA), wideband CDMA (WCDMA), ultra wideband(UWB) such as various devices which send and receive data withouttransmit lines, and so on.

The memory control unit 1160 is to administrate and process datatransmitted between the processor 1100 and an external storage deviceoperating according to a different communication standard. The memorycontrol unit 1160 may include various memory controllers, for example,devices which may control IDE (Integrated Device Electronics), SATA(Serial Advanced Technology Attachment), SCSI (Small Computer SystemInterface), RAID (Redundant Array of Independent Disks), an SSD (solidstate disk), eSATA (External SATA), PCMCIA (Personal Computer MemoryCard International Association), a USB (universal serial bus), a securedigital (SD) card, a mini secure digital (mSD) card, a micro securedigital (micro SD) card, a secure digital high capacity (SDHC) card, amemory stick card, a smart media (SM) card, a multimedia card (MMC), anembedded MMC (eMMC), a compact flash (CF) card, and so on.

The media processing unit 1170 may process the data processed in theprocessor 1100 or the data inputted in the forms of image, voice andothers from the external input device and output the data to theexternal interface device. The media processing unit 1170 may include agraphic processing unit (GPU), a digital signal processor (DSP), a highdefinition audio device (HD audio), a high definition multimediainterface (HDMI) controller, and so on.

FIG. 7 is an example of configuration diagram of a system implementingmemory circuitry based on the disclosed technology.

Referring to FIG. 7, a system 1200 as an apparatus for processing datamay perform input, processing, output, communication, storage, etc. toconduct a series of manipulations for data. The system 1200 may includea processor 1210, a main memory device 1220, an auxiliary memory device1230, an interface device 1240, and so on. The system 1200 of thepresent implementation may be various electronic systems which operateusing processors, such as a computer, a server, a PDA (personal digitalassistant), a portable computer, a web tablet, a wireless phone, amobile phone, a smart phone, a digital music player, a PMP (portablemultimedia player), a camera, a global positioning system (GPS), a videocamera, a voice recorder, a telematics, an audio visual (AV) system, asmart television, and so on.

The processor 1210 may decode inputted commands and processes operation,comparison, etc. for the data stored in the system 1200, and controlsthese operations. The processor 1210 may include a microprocessor unit(MPU), a central processing unit (CPU), a single/multi-core processor, agraphic processing unit (GPU), an application processor (AP), a digitalsignal processor (DSP), and so on.

The main memory device 1220 is a storage which can temporarily store,call and execute program codes or data from the auxiliary memory device1230 when programs are executed and can conserve memorized contents evenwhen power supply is cut off. The main memory device 1220 may includeone or more of the above-described semiconductor devices in accordancewith the implementations. For example, the main memory device 1220 mayinclude an interlayer dielectric layer formed over a substrate includingfirst and second areas; a first contact plug contacted with thesubstrate through the interlayer dielectric layer of the second area; ananti-peeling layer formed over the interlayer dielectric layer includingthe first contact plug; a second contact plug contacted with thesubstrate through the anti-peeling layer and the interlayer dielectriclayer in the first area; and a variable resistance pattern contactedwith the second contact plug. Through this, a fabrication process of themain memory device 1220 may be performed to improve the characteristicof the main memory device 1220. As a consequence, operatingcharacteristics of the system 1200 may be improved.

Also, the main memory device 1220 may further include a static randomaccess memory (SRAM), a dynamic random access memory (DRAM), and so on,of a volatile memory type in which all contents are erased when powersupply is cut off. Unlike this, the main memory device 1220 may notinclude the semiconductor devices according to the implementations, butmay include a static random access memory (SRAM), a dynamic randomaccess memory (DRAM), and so on, of a volatile memory type in which allcontents are erased when power supply is cut off.

The auxiliary memory device 1230 is a memory device for storing programcodes or data. While the speed of the auxiliary memory device 1230 isslower than the main memory device 1220, the auxiliary memory device1230 can store a larger amount of data. The auxiliary memory device 1230may include one or more of the above-described semiconductor devices inaccordance with the implementations. For example, the auxiliary memorydevice 1230 may include an interlayer dielectric layer formed over asubstrate including first and second areas; a first contact plugcontacted with the substrate through the interlayer dielectric layer ofthe second area; an anti-peeling layer formed over the interlayerdielectric layer including the first contact plug; a second contact plugcontacted with the substrate through the anti-peeling layer and theinterlayer dielectric layer in the first area; and a variable resistancepattern contacted with the second contact plug. Through this, afabrication process of the auxiliary memory device 1230 may be performedto improve the characteristic of the auxiliary memory device 1230. As aconsequence, operating characteristics of the system 1200 may beimproved.

Also, the auxiliary memory device 1230 may further include a datastorage system (see the reference numeral 1300 of FIG. 10) such as amagnetic tape using magnetism, a magnetic disk, a laser disk usingoptics, a magneto-optical disc using both magnetism and optics, a solidstate disk (SSD), a USB memory (universal serial bus memory), a securedigital (SD) card, a mini secure digital (mSD) card, a micro securedigital (micro SD) card, a secure digital high capacity (SDHC) card, amemory stick card, a smart media (SM) card, a multimedia card (MMC), anembedded MMC (eMMC), a compact flash (CF) card, and so on. Unlike this,the auxiliary memory device 1230 may not include the semiconductordevices according to the implementations, but may include data storagesystems (see the reference numeral 1300 of FIG. 7) such as a magnetictape using magnetism, a magnetic disk, a laser disk using optics, amagneto-optical disc using both magnetism and optics, a solid state disk(SSD), a USB memory (universal serial bus memory), a secure digital (SD)card, a mini secure digital (mSD) card, a micro secure digital (microSD) card, a secure digital high capacity (SDHC) card, a memory stickcard, a smart media (SM) card, a multimedia card (MMC), an embedded MMC(eMMC), a compact flash (CF) card, and so on.

The interface device 1240 may be to perform exchange of commands anddata between the system 1200 of the present implementation and anexternal device. The interface device 1240 may be a keypad, a keyboard,a mouse, a speaker, a mike, a display, various human interface devices(HIDs), a communication device, and so on. The communication device mayinclude a module capable of being connected with a wired network, amodule capable of being connected with a wireless network and both ofthem. The wired network module may include a local area network (LAN), auniversal serial bus (USB), an Ethernet, power line communication (PLC),such as various devices which send and receive data through transmitlines, and so on. The wireless network module may include Infrared DataAssociation (IrDA), code division multiple access (CDMA), time divisionmultiple access (TDMA), frequency division multiple access (FDMA), awireless LAN, Zigbee, a ubiquitous sensor network (USN), Bluetooth,radio frequency identification (RFID), long term evolution (LTE), nearfield communication (NFC), a wireless broadband Internet (Wibro), highspeed downlink packet access (HSDPA), wideband CDMA (WCDMA), ultrawideband (UWB), such as various devices which send and receive datawithout transmit lines, and so on.

FIG. 8 is an example of configuration diagram of a data storage systemimplementing memory circuitry based on the disclosed technology.

Referring to FIG. 8, a data storage system 1300 may include a storagedevice 1310 which has a nonvolatile characteristic as a component forstoring data, a controller 1320 which controls the storage device 1310,an interface 1330 for connection with an external device, and atemporary storage device 1340 for storing data temporarily. The datastorage system 1300 may be a disk type such as a hard disk drive (HDD),a compact disc read only memory (CDROM), a digital versatile disc (DVD),a solid state disk (SSD), and so on, and a card type such as a USBmemory (universal serial bus memory), a secure digital (SD) card, a minisecure digital (mSD) card, a micro secure digital (micro SD) card, asecure digital high capacity (SDHC) card, a memory stick card, a smartmedia (SM) card, a multimedia card (MMC), an embedded MMC (eMMC), acompact flash (CF) card, and so on.

The storage device 1310 may include a nonvolatile memory which storesdata semi-permanently. The nonvolatile memory may include a ROM (readonly memory), a NOR flash memory, a NAND flash memory, a phase changerandom access memory (PRAM), a resistive random access memory (RRAM), amagnetic random access memory (MRAM), and so on.

The controller 1320 may control exchange of data between the storagedevice 1310 and the interface 1330. To this end, the controller 1320 mayinclude a processor 1321 for performing an operation for, processingcommands inputted through the interface 1330 from an outside of the datastorage system 1300 and so on.

The interface 1330 is to perform exchange of commands and data betweenthe data storage system 1300 and the external device. In the case wherethe data storage system 1300 is a card type, the interface 1330 may becompatible with interfaces which are used in devices, such as a USBmemory (universal serial bus memory), a secure digital (SD) card, a minisecure digital (mSD) card, a micro secure digital (micro SD) card, asecure digital high capacity (SDHC) card, a memory stick card, a smartmedia (SM) card, a multimedia card (MMC), an embedded MMC (eMMC), acompact flash (CF) card, and so on, or be compatible with interfaceswhich are used in devices similar to the above mentioned devices. In thecase where the data storage system 1300 is a disk type, the interface1330 may be compatible with interfaces, such as IDE (Integrated DeviceElectronics), SATA (Serial Advanced Technology Attachment), SCSI (SmallComputer System Interface), eSATA (External SATA), PCMCIA (PersonalComputer Memory Card International Association), a USB (universal serialbus), and so on, or be compatible with the interfaces which are similarto the above mentioned interfaces. The interface 1330 may be compatiblewith one or more interfaces having a different type from each other.

The temporary storage device 1340 can store data temporarily forefficiently transferring data between the interface 1330 and the storagedevice 1310 according to diversifications and high performance of aninterface with an external device, a controller and a system. Thetemporary storage device 1340 for temporarily storing data may includeone or more of the above-described semiconductor devices in accordancewith the implementations. The temporary storage device 1340 may includean interlayer dielectric layer formed over a substrate including firstand second areas; a first contact plug contacted with the substratethrough the interlayer dielectric layer of the second area; ananti-peeling layer formed over the interlayer dielectric layer includingthe first contact plug; a second contact plug contacted with thesubstrate through the anti-peeling layer and the interlayer dielectriclayer in the first area; and a variable resistance pattern contactedwith the second contact plug. Through this, a fabrication process of thestorage device 1310 or the temporary storage device 1340 may beperformed to improve the characteristic of the storage device 1310 orthe temporary storage device 1340. As a consequence, operatingcharacteristics of the data storage system 1300 may be improved.

FIG. 9 is an example of configuration diagram of a memory systemimplementing memory circuitry based on the disclosed technology.

Referring to FIG. 9, a memory system 1400 may include a memory 1410which has a nonvolatile characteristic as a component for storing data,a memory controller 1420 which controls the memory 1410, an interface1430 for connection with an external device, and so on. The memorysystem 1400 may be a card type such as a solid state disk (SSD), a USBmemory (universal serial bus memory), a secure digital (SD) card, a minisecure digital (mSD) card, a micro secure digital (micro SD) card, asecure digital high capacity (SDHC) card, a memory stick card, a smartmedia (SM) card, a multimedia card (MMC), an embedded MMC (eMMC), acompact flash (CF) card, and so on.

The memory 1410 for storing data may include one or more of theabove-described semiconductor devices in accordance with theimplementations. For example, the memory 1410 may include an interlayerdielectric layer formed over a substrate including first and secondareas; a first contact plug contacted with the substrate through theinterlayer dielectric layer of the second area; an anti-peeling layerformed over the interlayer dielectric layer including the first contactplug; a second contact plug contacted with the substrate through theanti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with the secondcontact plug. Through this, a fabrication process of the memory 1410 maybe performed to improve the characteristic of the memory 1410. As aconsequence, operating characteristics of the memory system 1400 may beimproved.

Also, the memory 1410 according to the present implementation mayfurther include a ROM (read only memory), a NOR flash memory, a NANDflash memory, a phase change random access memory (PRAM), a resistiverandom access memory (RRAM), a magnetic random access memory (MRAM), andso on, which have a nonvolatile characteristic.

The memory controller 1420 may control exchange of data between thememory 1410 and the interface 1430. To this end, the memory controller1420 may include a processor 1421 for performing an operation for andprocessing commands inputted through the interface 1430 from an outsideof the memory system 1400.

The interface 1430 is to perform exchange of commands and data betweenthe memory system 1400 and the external device. The interface 1430 maybe compatible with interfaces which are used in devices, such as a USBmemory (universal serial bus memory), a secure digital (SD) card, a minisecure digital (mSD) card, a micro secure digital (micro SD) card, asecure digital high capacity (SDHC) card, a memory stick card, a smartmedia (SM) card, a multimedia card (MMC), an embedded MMC (eMMC), acompact flash (CF) card, and so on, or be compatible with interfaceswhich are used in devices similar to the above mentioned devices. Theinterface 1430 may be compatible with one or more interfaces having adifferent type from each other.

The memory system 1400 according to the present implementation mayfurther include a buffer memory 1440 for efficiently transferring databetween the interface 1430 and the memory 1410 according todiversification and high performance of an interface with an externaldevice, a memory controller and a memory system. For example, the buffermemory 1440 for temporarily storing data may include one or more of theabove-described semiconductor devices in accordance with theimplementations. The buffer memory 1440 may include an interlayerdielectric layer formed over a substrate including first and secondareas; a first contact plug contacted with the substrate through theinterlayer dielectric layer of the second area; an anti-peeling layerformed over the interlayer dielectric layer including the first contactplug; a second contact plug contacted with the substrate through theanti-peeling layer and the interlayer dielectric layer in the firstarea; and a variable resistance pattern contacted with the secondcontact plug. Through this, a fabrication process of the buffer memorymay be performed to improve the characteristic of the buffer memory. Asa consequence, operating characteristics of the memory system 1400 maybe improved.

Moreover, the buffer memory 1440 according to the present implementationmay further include an SRAM (static random access memory), a DRAM(dynamic random access memory), and so on, which have a volatilecharacteristic, and a phase change random access memory (PRAM), aresistive random access memory (RRAM), a spin transfer torque randomaccess memory (STTRAM), a magnetic random access memory (MRAM), and soon, which have a nonvolatile characteristic. Unlike this, the buffermemory 1440 may not include the semiconductor devices according to theimplementations, but may include an SRAM (static random access memory),a DRAM (dynamic random access memory), and so on, which have a volatilecharacteristic, and a phase change random access memory (PRAM), aresistive random access memory (RRAM), a spin transfer torque randomaccess memory (STTRAM), a magnetic random access memory (MRAM), and soon, which have a nonvolatile characteristic.

As is apparent from the above descriptions, in the semiconductor deviceand the method for fabricating the same in accordance with theimplementations, patterning of a resistance variable element is easy,and it is possible to secure the characteristics of the resistancevariable element.

Features in the above examples of electronic devices or systems in FIGS.5-9 based on the memory devices disclosed in this document may beimplemented in various devices, systems or applications. Some examplesinclude mobile phones or other portable communication devices, tabletcomputers, notebook or laptop computers, game machines, smart TV sets,TV set top boxes, multimedia servers, digital cameras with or withoutwireless communication functions, wrist watches or other wearabledevices with wireless communication capabilities.

While this patent document contains many specifics, these should not beconstrued as limitations on the scope of any invention or of what may beclaimed, but rather as descriptions of features that may be specific toparticular embodiments of particular inventions. Certain features thatare described in this patent document in the context of separateembodiments can also be implemented in combination in a singleembodiment. Conversely, various features that are described in thecontext of a single embodiment can also be implemented in multipleembodiments separately or in any suitable subcombination. Moreover,although features may be described above as acting in certaincombinations and even initially claimed as such, one or more featuresfrom a claimed combination can in some cases be excised from thecombination, and the claimed combination may be directed to asubcombination or variation of a subcombination.

Similarly, while operations are depicted in the drawings in a particularorder, this should not be understood as requiring that such operationsbe performed in the particular order shown or in sequential order, orthat all illustrated operations be performed, to achieve desirableresults. Moreover, the separation of various system components in theembodiments described in this patent document should not be understoodas requiring such separation in all embodiments.

Only a few implementations and examples are described. Otherimplementations, enhancements and variations can be made based on whatis described and illustrated in this patent document.

What is claimed is:
 1. An electronic device comprising a semiconductormemory, wherein the semiconductor memory comprises: an interlayerdielectric layer formed over a substrate including first and secondareas; a first contact plug formed over the substrate to pass throughthe interlayer dielectric layer of the second area; an anti-peelinglayer formed over the interlayer dielectric layer including the firstcontact plug to cover the first contact plug; a second contact plugformed over the substrate to pass through the anti-peeling layer and theinterlayer dielectric layer in the first area; and a variable resistancepattern contacted with and formed over the second contact plug and abovethe anti-peeling layer.
 2. The electronic device of claim 1, wherein aportion of the variable resistance pattern is formed over theanti-peeling layer.
 3. The electronic device of claim 1, wherein theanti-peeling layer includes a stacked structure of a passivation layerand an adhesive layer.
 4. The electronic device of claim 3, wherein theadhesive layer is formed around a top end of the second contact plug. 5.The electronic device of claim 3, wherein the passivation layer includesan insulating material.
 6. The electronic device of claim 3, wherein theadhesive layer includes silicon.
 7. The electronic device of claim 1,wherein a top surface of the second contact plug is higher than a topsurface of the first contact plug.
 8. The electronic device of claim 1,further including: a third contact plug formed over the variableresistance pattern of the first area; and a conductive line formed overthe third contact plug and coupled to the variable resistance patternthrough the third contact plug.
 9. The electronic device of claim 1,further comprising: a metal wiring of the second area; and a fourthcontact plug for coupling the metal wiring to the first contact plug.10. The electronic device according to claim 1, further comprising amicroprocessor which includes: a control unit configured to receive asignal including a command from an outside of the microprocessor, andperforms extracting, decoding of the command, or controlling input oroutput of a signal of the microprocessor; an operation unit configuredto perform an operation based on a result that the control unit decodesthe command; and a memory unit configured to store data for performingthe operation, data corresponding to a result of performing theoperation, or an address of data for which the operation is performed,wherein the semiconductor memory unit is part of the memory unit in themicroprocessor.
 11. The electronic device according to claim 1, furthercomprising a processor which includes: a core unit configured toperform, based on a command inputted from an outside of the processor,an operation corresponding to the command, by using data; a cache memoryunit configured to store data for performing the operation, datacorresponding to a result of performing the operation, or an address ofdata for which the operation is performed; and a bus interface connectedbetween the core unit and the cache memory unit, and configured totransmit data between the core unit and the cache memory unit, whereinthe semiconductor memory unit is part of the cache memory unit in theprocessor.
 12. The electronic device according to claim 1, furthercomprising a processing system which includes: a processor configured todecode a command received by the processor and control an operation forinformation based on a result of decoding the command; an auxiliarymemory device configured to store a program for decoding the command andthe information; a main memory device configured to call and store theprogram and the information from the auxiliary memory device such thatthe processor can perform the operation using the program and theinformation when executing the program; and an interface deviceconfigured to perform communication between at least one of theprocessor, the auxiliary memory device and the main memory device andthe outside, wherein the semiconductor memory unit is part of theauxiliary memory device or the main memory device in the processingsystem.
 13. The electronic device according to claim 1, furthercomprising a data storage system which includes: a storage deviceconfigured to store data and conserve stored data regardless of powersupply; a controller configured to control input and output of data toand from the storage device according to a command inputted form anoutside; a temporary storage device configured to temporarily store dataexchanged between the storage device and the outside; and an interfaceconfigured to perform communication between at least one of the storagedevice, the controller and the temporary storage device and the outside,wherein the semiconductor memory unit is part of the storage device orthe temporary storage device in the data storage system.
 14. Theelectronic device according to claim 1, further comprising a memorysystem which includes: a memory configured to store data and conservestored data regardless of power supply; a memory controller configuredto control input and output of data to and from the memory according toa command inputted form an outside; a buffer memory configured to bufferdata exchanged between the memory and the outside; and an interfaceconfigured to perform communication between at least one of the memory,the memory controller and the buffer memory and the outside, wherein thesemiconductor memory unit is part of the memory or the buffer memory inthe memory system.
 15. An electronic device comprising a semiconductormemory which includes, a substrate including a first area and a secondarea; a first contact plug and a second contact plug formed over thesubstrate of the second area and the first area, respectively; avariable resistance pattern formed over the second contact plug and inelectrical contact with the second contact plug; and an anti-peelinglayer formed to extend in both the first and second area to be above thefirst contact plug and below the variable resistance pattern andincludes an opening through which the second contact plug passes throughto reach the variable resistance pattern above the anti-peeling layer,wherein the anti-peeling layer isolates the first contact plug fromlayers formed above the anti-peeling layer and from fabricationprocesses performed after formation of the anti-peeling layer.
 16. Theelectronic device of claim 15, wherein a top surface of the secondcontact plug is higher than a top surface of the first contact plug. 17.The electronic device of claim 15, the anti-peeling layer includesnitride, oxide, or silicon.
 18. The electronic device of claim 15,wherein the anti-peeling layer includes a stacked structure of apassivation layer and an adhesive layer.
 19. A method for fabricating anelectronic device including a semiconductor memory, comprising: forminga first interlayer dielectric layer over a substrate including first andsecond areas; forming a first contact plug over the substrate to passthrough the first interlayer dielectric layer of the second area;forming an anti-peeling layer over the first interlayer dielectric layerincluding the first contact plug to cover the first contact plug; afterforming the anti-peeling layer covering the first contact plug, forminga second contact plug over the substrate to pass through theanti-peeling layer and the first interlayer dielectric layer in thefirst area; and subsequently forming a variable resistance pattern overthe second contact plug and above the anti-peeling layer.
 20. The methodof claim 19, wherein the forming of the variable resistance patternincludes: forming a variable resistance layer over the anti-peelinglayer including the second contact plug; and etching the variableresistance layer so as to form the variable resistance pattern over thesecond contact plug while isolating the first contact plug that iscovered by the anti-peeling layer from an impact of patterning thevariable resistance layer.